The Three Main IRA Categories

For this article, the main categories are the Traditional IRA, the Roth IRA, and the SEP IRA. A SEP IRA is technically still an IRA structure, but it operates differently because it is generally funded by employer contributions and is often used by self-employed individuals or small businesses. The IRS provides an overview of IRA types on its website.

Traditional IRA: How It Works

A traditional IRA is an individual retirement arrangement that may allow a current-year tax deduction for contributions, depending on the taxpayer’s income and retirement-plan coverage.

Main Tax Idea

A deductible traditional IRA usually gives the taxpayer a benefit upfront. Contributions may reduce current taxable income. Growth inside the account is tax-deferred, and later distributions are generally taxable.

2025 Contribution Limit

For 2025, the general IRA contribution limit remains $7,000, or $8,000 if age 50 or older. This combined limit generally applies across traditional and Roth IRAs together, not separately.

Deduction Rules

A taxpayer can contribute to a traditional IRA, but whether the contribution is deductible depends on income and whether the taxpayer or spouse is covered by a retirement plan at work. A traditional IRA contribution is not automatically deductible — some contributions are deductible, and some are nondeductible. A nondeductible traditional IRA still has tax consequences and basis-tracking rules.

Pros

• Potential current-year deduction
• Tax-deferred growth
• Useful for taxpayers who expect to be in a lower tax bracket later
• May help reduce current-year AGI in the right facts

Cons

• Future withdrawals are generally taxable
• Deduction may be limited or phased out
• Nondeductible contributions create basis-tracking complexity
• Required minimum distributions eventually apply

Roth IRA: How It Works

A Roth IRA is generally funded with after-tax money. There is usually no current-year deduction for the contribution, but qualified withdrawals can be tax-free.

Main Tax Idea

The Roth tradeoff is the opposite of the traditional IRA tradeoff. You usually do not get the deduction now, but the future tax treatment may be much better.

2025 Contribution Limit

The same combined annual IRA contribution limit generally applies: $7,000, or $8,000 if age 50 or older, across traditional and Roth IRAs combined.

Roth Income Limits

Roth IRA contributions are subject to modified AGI limits. If income is too high, the allowable direct Roth contribution may be reduced or eliminated.

Pros

• Qualified future withdrawals can be tax-free
• Useful for taxpayers who expect higher future rates
• No required minimum distributions during the owner’s lifetime

Cons

• No current-year deduction
• Direct contribution may be blocked by income limits
• Some taxpayers prefer the immediate deduction of a traditional account

SEP IRA: How It Works

A SEP IRA is usually used by self-employed taxpayers and small-business owners. It is a simplified employer contribution arrangement.

Main Tax Idea

SEP IRAs are generally funded by employer contributions, not regular employee elective contributions like a traditional or Roth IRA. They can allow much larger contributions than a standard personal IRA.

2025 SEP Contribution Limits

For 2025, employer SEP contributions generally cannot exceed the lesser of 25% of compensation or $70,000. The compensation cap used in the calculation is also limited.

Why SEP IRAs Are Attractive

They can be simple to establish and allow much larger contributions than standard personal IRAs.

Why SEP IRAs Create Planning Issues

Because SEP balances are generally treated as traditional IRA money for many tax purposes, they can interfere with backdoor Roth planning through the pro rata rule.

Backdoor Roth IRA Contributions

A backdoor Roth strategy usually means making a nondeductible contribution to a traditional IRA, and then converting that amount to a Roth IRA. This strategy is often used by higher-income taxpayers who cannot make direct Roth contributions because of the income limits.

Why the Pro Rata Rule Matters

This is the most important caution in backdoor Roth planning.

If the taxpayer has existing traditional IRA, SEP IRA, or SIMPLE IRA balances, the conversion is not usually treated as if only the new nondeductible contribution was converted. Instead, the tax law generally looks across the taxpayer’s IRA balances and applies a proportionate or pro rata approach.

That means the conversion may be partly taxable, even if the taxpayer thought they were just converting the after-tax amount. This is one of the biggest traps in IRA planning.

Why SEP Balances Can Ruin a Clean Backdoor Roth

A taxpayer may think they can contribute nondeductible money to a traditional IRA and immediately convert it with little or no tax cost. But if the taxpayer already has pre-tax SEP IRA balances, those balances are usually part of the same pro rata universe.

In practical terms, a SEP IRA balance can make a backdoor Roth conversion partially taxable even though the taxpayer’s new contribution itself was after-tax.

Form 8606 and IRA Basis

Form 8606 is critical whenever nondeductible traditional IRA contributions exist or when traditional, SEP, or SIMPLE IRA money is converted to Roth. It is the form that tracks basis and helps determine how much of a conversion or distribution is taxable.

If you make nondeductible IRA contributions and do not report them properly, you can end up effectively paying tax twice on the same money.

Traditional IRA vs. Roth IRA: Which Is Better?

Traditional IRA May Be Better If:

• You qualify for the deduction
• You are in a relatively high tax bracket now
• You expect a lower bracket later
• You value current-year tax relief

Roth IRA May Be Better If:

• You are in a relatively low bracket now
• You expect higher future rates
• You want tax-free qualified withdrawals later
• You value future tax flexibility more than a current deduction

SEP IRA vs. Personal IRA: Which Is Better?

SEP IRAs often win on contribution capacity for self-employed taxpayers or owner-operators because the dollar limits can be dramatically larger. But that does not mean they are always the best planning answer. Sometimes a taxpayer also wants Roth flexibility, and the SEP structure complicates that. See also our guide on S corporation benefits and reporting for how entity structure can affect retirement plan choices.

Tax-Efficient Strategy: Roth in Low-Income Years

One of the most powerful Roth ideas is not just “Roth is good.” It is that Roth contributions or Roth conversions may be especially attractive in low-income years.

A low-income year can happen because you took time off work, you are early in your career, business income dipped temporarily, you sold a business and have a transition year, or you retired but have not yet begun major taxable distributions.

In those years, paying tax now to secure future tax-free treatment may be especially attractive.

Custodial Roth IRA for a Child

A custodial Roth IRA can be a powerful strategy for a child who has earned income. The child must have actual earned income, but where that exists, the long-term compounding potential can be enormous.

This is one of the most tax-efficient family wealth-building strategies because the money goes into a Roth environment early, the child may be in a very low tax bracket, and decades of tax-free qualified growth may follow.

Common Mistakes in IRA Planning

• Assuming all traditional IRA contributions are deductible
• Forgetting Roth income limits
• Making backdoor Roth moves without considering SEP or traditional balances
• Failing to file Form 8606 for nondeductible contributions
• Choosing an IRA type based only on what sounds good now rather than on broader tax timing

Why This Planning Matters

IRA planning is not just about retirement. It is about tax timing. The core question is whether it is better to get the tax benefit now, later, or through a larger small-business contribution structure.

That is why the right answer depends on the taxpayer’s current bracket, expected future bracket, business structure, existing IRA balances, and long-term flexibility needs. For related topics, see our guides on Schedule C, how K-1s work, and the Tax Strategy Guides for broader planning strategies.